<template>
  <div class="component-upload-image">
    <el-upload
      multiple
      :action="uploadImgUrl"
      :on-success="handleUploadSuccess"
      :before-upload="handleBeforeUpload"
      :list-type="listType"
      :limit="limit"
      :on-error="handleUploadError"
      :on-exceed="handleExceed"
      ref="imageUpload"
      :on-remove="handleDelete"
      :show-file-list="true"
      :headers="headers"
      :file-list="fileList"
      :on-preview="handlePictureCardPreview"
      :accept="accept"
      :class="{ hide: fileList.length >= limit }"
    >
      <i v-if="listType === 'picture-card'" class="el-icon-plus"></i>
      <el-button v-else type="primary" size="mini">选择文件</el-button>
    </el-upload>

    <!-- 上传提示 -->
    <div class="el-upload__tip" slot="tip" v-if="showTip">
      请上传
      <template v-if="fileSize">
        大小不超过 <b style="color: #f56c6c">{{ fileSize }}MB</b>
      </template>
      <template v-if="fileType">
        格式为 <b style="color: #f56c6c">{{ fileType.join("/") }};</b>
      </template>
      的文件
      <div v-if="extraTips">
        {{ extraTips }}
      </div>
    </div>

    <el-dialog
      :visible.sync="dialogVisible"
      title="预览"
      width="800"
      append-to-body
    >
      <video
        v-if="previewType === 'mp4'"
        controls
        :autoplay="false"
        :src="dialogUrl"
        style="display: block; max-width: 100%; margin: 0 auto; height: 400px"
      ></video>
      <img
        v-else
        :src="dialogUrl"
        style="display: block; max-width: 100%; margin: 0 auto"
      />
    </el-dialog>
  </div>
</template>

<script>
import { omit } from "lodash";
import { getToken } from "@/utils/auth";

export default {
  props: {
    value: [String, Object, Array],
    // 图片数量限制
    limit: {
      type: Number,
      default: 5,
    },
    // 大小限制(MB)
    fileSize: {
      type: Number,
      default: 2200,
    },
    // 文件类型, 例如['png', 'jpg', 'jpeg']
    fileType: {
      type: [Array, Boolean],
      default: () => ["png", "jpg", "jpeg"],
    },
    // 是否显示提示
    isShowTip: {
      type: Boolean,
      default: true,
    },
    listType: {
      type: String,
      default: "picture-card",
    },
    accept: {
      type: String,
      default: "image/*",
    },
    extraTips: {
      type: String,
      default: "",
    },
  },
  data() {
    return {
      number: 0,
      uploadList: [],
      dialogUrl: "",
      dialogVisible: false,
      uploadImgUrl: `${process.env.VUE_APP_BASE_API}/oss/minio/upload`, // 上传的图片服务器地址
      headers: {
        Authorization: "Bearer " + getToken(),
      },
      fileList: [],
      currFileSize: "",
    };
  },
  watch: {
    value: {
      handler(val) {
        if (val) {
          if (typeof val === "string") {
            // 首先将值转为数组
            const list = Array.isArray(val) ? val : this.value.split(",");
            // 然后将数组转为对象数组
            this.fileList = list.map((item) => {
              if (typeof item === "string") {
                item = { name: item, url: item };
              }
              return item;
            });
          } else {
            this.fileList = val.map((i) => ({
              ...i,
              name: i.fileName,
            }));
          }
        } else {
          this.fileList = [];
          return [];
        }
      },
      deep: true,
      immediate: true,
    },
  },
  computed: {
    previewType() {
      const urlArr = this.dialogUrl.split(".");
      return urlArr[urlArr.length - 1];
    },
    // 是否显示提示
    showTip() {
      return this.isShowTip && (this.fileType || this.fileSize);
    },
  },
  methods: {
    // 上传前loading加载
    async handleBeforeUpload(file) {
      let isImg = false;
      if (this.fileType && this.fileType.length) {
        let fileExtension = "";
        if (file.name.lastIndexOf(".") > -1) {
          fileExtension = file.name.slice(file.name.lastIndexOf(".") + 1);
        }
        isImg = this.fileType.some((type) => {
          if (file.type.indexOf(type) > -1) return true;
          if (fileExtension && fileExtension.indexOf(type) > -1) return true;
          return false;
        });
      } else {
        isImg = true;
      }

      if (!isImg) {
        this.$modal.msgError(
          `文件格式不正确, 请上传${this.fileType.join("/")}图片格式文件!`
        );

        return false;
      }
      if (this.fileSize) {
        const isLt = file.size / 1024 / 1024 < this.fileSize;
        if (!isLt) {
          this.$modal.msgError(`上传图片大小不能超过 ${this.fileSize} MB!`);
          return false;
        }
      }
      this.$modal.loading("正在上传中，请稍候...");
      this.currFileSize = file.size;
      this.number++;
    },
    // 文件个数超出
    handleExceed() {
      this.$modal.msgError(`上传文件数量不能超过 ${this.limit} 个!`);
    },
    // 上传成功回调
    handleUploadSuccess({ data }) {
      console.log(data);
      const { originalFileName, url } = data;
      this.uploadList.push({
        originalFilename: originalFileName,
        url,
        name: originalFileName,
      });
      this.$emit("uploadSuccess", {
        url,
        fileSize: this.currFileSize,
        originalFileName: originalFileName,
      });
      this.uploadedSuccessfully();
    },
    // 上传结束处理
    uploadedSuccessfully() {
      if (this.number > 0 && this.uploadList.length === this.number) {
        this.fileList = this.fileList.concat(this.uploadList);
        this.uploadList = [];
        this.number = 0;
        if (this.limit === 1) {
          this.$emit("input", this.listToString(this.fileList));
        } else {
          this.$emit(
            "input",
            this.fileList.map((i) => {
              return omit(i, ["status", "uid", "name"]);
            })
          );
        }
        this.$modal.closeLoading();
      }
    },
    // 删除图片
    handleDelete(file) {
      const findex = this.fileList.map((f) => f.name).indexOf(file.name);
      if (findex > -1) {
        this.fileList.splice(findex, 1);
        this.$emit("input", this.listToString(this.fileList));
      }
    },
    // 上传失败
    handleUploadError() {
      this.$modal.msgError("上传图片失败，请重试");
      this.$modal.closeLoading();
    },
    // 预览
    handlePictureCardPreview(file) {
      this.dialogUrl = file.url;
      this.$nextTick(() => {
        this.dialogVisible = true;
      });
    },
    // 对象转成指定字符串分隔
    listToString(list, separator) {
      let strs = "";
      separator = separator || ",";
      for (let i in list) {
        if (list[i].url) {
          strs += list[i].url + separator;
        }
      }
      return strs != "" ? strs.substr(0, strs.length - 1) : "";
    },
  },
};
</script>
<style scoped lang="scss">
// .el-upload--picture-card 控制加号部分
::v-deep.hide .el-upload--picture-card {
  display: none;
}
// 去掉动画效果
::v-deep .el-list-enter-active,
::v-deep .el-list-leave-active {
  transition: all 0s;
}

::v-deep .el-list-enter,
.el-list-leave-active {
  opacity: 0;
  transform: translateY(0);
}
</style>
